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Posted by: Anton
Hey doober, well I put in the 145 jet and did a ride for about 1hr, pulled the plug it was white,
turned the air mix screw out 1/4 from factory setting, it was whiter, turned it 1/2 in from fact will run it today and see. It does run good but I didn't like the colour of the plug, so I will have to test more.
Shouldn't this air mixing screw help with minor adjustments? And ,out more fuel, in less fuel?
Also if the air mix screw doesn't help would you recommend going to the 135 or 140, or should I go up with the # of jet keep in mind I started at the 150 and the plug was black. I think I can get a 147.
On a fun side I did some water wheelies, about 20 of them I think I was signing surfing USA.
Ha Ha
Posted by: Anton
I have the K&N also, thats when I noticed that the bike was off, I also had the 150 jet and when I pulled the plug it was black. So I went to my dealer talked to him about it and I was told to try the 145, and to try and fine tune it with the mixing screw. I installed the 145 and set the screw at factory two turns out. took it for 1 hr about 25 miles [took my time]. Looked at the plug white in the middle, so I turned the screw out 1/2 from factory, drove home. It was even whiter, so now I will try to turn the screw 1/2 the other way and see what happens. at that time I will see if I should change the jet or not? I know the 150 didn't work so I will defiantly have to find the right combo. I will let you guys know what happens. Hopefully my motor wont blow?????????
Posted by: Anton
Hey Guys
just in case, are we talking about the same mixing screw? There is one on a cable that will allow you to ajust the idle. the one I'm talking about is at the bottem of the carb just beside the bowel.
Posted by: Anton
Shoud be a 150 as mine was. how about, doober & southernmud
Posted by: Anton
Ok thanks guys,
Just talked to my dealer and he is going to order me a 147 jet. will try that, so to recap my 150 was to rich turning the plug black, the 145 was to lean turning the plug grey to white soooooo. the 147 should be juuust right. I fell like goldy locks.
Thanks for the help and any of it you give.
Posted by: Anton
Well after much searching I am at sea level to 160 feet above,
Posted by: Anton
ok doober what do you know about elevation?
tta583 try this link , http://www.brownsleisureworld.com/Parts/ATV/ it will bring you to some micro fich all I have as for information about how these things work.
Posted by: Anton
Hey guys
Just for fun I took some of the carb apart and cleaned the, you know what out of it. put the 150 back in and took it for a little spin. Well was able to get it up to 53 miles per and was still climbing? Did however notice some small backfire when letting off the gas not as bad as before. Did set the airscrew at factory two turns out. Now I did notice when I 1st played with this screw it was originally set at 1 3/4 out. I don't now if this is the fix but will run more tests and let you know ........dah ....maybe the carb was dirty
Posted by: ricerocket
have you tried adjusting the needle jet height i belive it says to go on #3 try droping it down one or up one
Posted by: ricerocket
southernmud it sounds to me like it is the needle jet setting go back to the 132 or 134 and move the needle jet to 2 or 4. Number 3 is for the stock setting that is where mine is set. I was having a problem with a polaris jet kit and dynojet told me to adjust the needle. If all else fails call dyno jet at 800-992-4993 they are very helpful and really know what they are doing. I have made many calls to ask questions about adjustability. Where did you buy the kit and how much did you pay for it?
Posted by: doober
That is how you test a 2 stroke, I was told to get it to where it runs good, then take it for a ride, but take it easy just in case it is lean, for about 10-15 miles or so then check your plug colour, that is what my dealer told me cause I was doing the same thing with the same results. So the 132 was probably close.
Posted by: doober
Southernmud, to answer your first ?? No they are different, by how much I dont know. And anton I have never played with the air mix screw, I just played with my jetting, that is what is the main thing I was told, I was told it will mostly do your idle more than anything so weather this is true or not I dont know, after an hour how many miles did you get on,and was your plug white or starting to turn a bit?? When I played with my jetting I put on a good 20 -25 miles then checked my plug and went from there, this is what my dealer told me to do to get the jetting right, if you notice any bogging or anything unusual, stop and check. or go back to your last jet that worked and try it a bit longer and see what happens, is what I was told, I am no pro at jetting so what I say is by no means law, it is what I have been told by my dealer.
Posted by: doober
southernmud, you are on the right track, how long did it take you to get the different colour on your plug, quite a while probably hey?? I think I need to put mine down a bit cause I am getting a backfire and burning way too much fuel, last year I could go 100 miles + but this year I almost polished off a tank in 55, now even working it hard I should get better that that. They changed my choke plunged and there is no way to adjust it and I think it is to tight so letting in to much fuel. Oh well back to the dealer to deal with it.
Posted by: doober
yea my stock was a 150 main also, I cant remember what I have in there right now though, it is in the mid to high 150's now after I did the muffler mod, it was running really lean.
Posted by: doober
What altitude do you ride at anton?
Posted by: doober
Anton, my knowledge about elevation is limited, I am at about 2-3000 ft, and was more interested in a comparison in jetting for elevation, I cant remember what I have in there though. But I am going to look and see, cause something is not right. Ricerocket I dont think these have an adjustable needle on them stock do they??
Posted by: DikTok
If you are running rich with stock jetting. Try taking off your air box lid and give it a good ride. If your plug looks good. Turn out your air screw one turn. Do not rejet down. Make shure your air filter is clean also. You just need more air.
Posted by: tta583
OK, real dumb question. Is there a page out in the vast I-net that has some additional info on these carbs? To be honest, I don't even know who made it (the carb). I am thinking of a jet kit myself but I would prefer to understand more about what adjustments I have before I start messing with a perfectly good running motor.
Thanks
Brent
Posted by: treehead
I am also thinking of jetting my 400 can anyone tell me what size the factory jet is?
Thanks
Posted by: southernmud
I put a dyno jet kit on my 04' 400 and it runs better for sure, I then ordered a k&n filter for it and decided I should do a check on the plug to make sure it is not lean, well with a WOT pass and then killing it while still getting on it, the plug was as white as a ghost, so we went up and up and up and up, testing every time to no avail, plug was still white, Dynojet recomended 132 we are now at 144 and the plug is still white. just a little note the scooter ran like scalded dog with 140 jet in it. Please help. any input would be great, I just don't want to burn my motor up running it to lean. Thanks
Posted by: southernmud
hey guys, I've got a silly question. Are the number sizes on the cat factory jets the same as the numbers on the dynajet jets, if so I guess im going to be going back to my factory 150 since I have increased air flow in mine with a K&N filter, or at least something closer to the 150. I rode mine around easy yesterday and did get some color on the plug, but it definently goes white if you stay in it for about 45 sec's. cya
Posted by: southernmud
The idle mixture screw will only adjust your off idle response and idle mixture, it will not affect the color on your plug while runing it, to do this you need more jet. I put my factory 150 jet back in today as I stuck a needle in it and the dynajet jet and found that the factory 150 was indeed larger than the dynajet 144, by quite a bit. I ran my scooter just a little bit today and have gotten a grey color to the plug, so I think Im getting close. Thanks to all for any input.
Posted by: southernmud
eh, I think I am almost there if not there, I may try to go 2 #'s more but first Im going to look for any air leaks, I just cant believe that dynojet's kit would recomend me so lean, they must of sent me the wrong kit or something. Thanks again
Posted by: southernmud
yeh, your 400 should have the 150 jet in it from the factory, and mine was rich with this jet and all stock components, but I think with the k&n filter and the dynojet needle I am going to go 152. As for the idle mixture screw I am speaking of the one that is hard to get to with the carb on the scooter that you have to adjust with a very small screwdriver. This should not really affect what your plug looks like running realy, maybe just a bit, but it is more for your idle and also your off idle throttle response, of coarse your needle affects this to. Good Luck
Posted by: southernmud
little backfiring is normal when you let off after laying on it. I put my factory 150 back in but left the dynojet needle in and set the screw out 2.5 turns, its running good and the lean condition is not so bad anymore. I have a k&n filter with dynojet needle set on there recomendation and stock exhaust. Im at sea level. Just to give an idea on performance I was easily able to run 45 to 48 up hill. Im happy!! thats faster than I need to go, im also getting good throttle response now. on pavement it actually lifts the front wheels a little and I have 27" mudlights. Good luck to all, thanks to everyone who helped me.
Posted by: southernmud
Denniskirk.com I paid around 50 bucks. I will look into muving the clip on the needle, this is what you mean correct. and what notch do you recomend fromthe top.
